ePresence - Webcast system - open source

ePresence is an enterprise level webcast or lecture capture system.  It is listed as open source.  You can download the source code etc.  They now offer packages ready to go that you can buy along with support to get you up and going.  ePresence captures video, audio, and slides.  Does the indexing and archiving and outputs to many popular media formats.  

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Audacity - Open Source Software for PC and Mac

Audacity is free, open source software for recording and editing audio. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems. It is perfect software for recording audio for podcasts on your computer.   Read more